tex-tex4ebook{,-doc}: update to 0.3j

0.3i
-fixed support for files with diacritics and dots in the name
-fixed various bugs in creating Epub metadata
-added support for multiple tables of contents in Epub 3 files
-added support for \label in footnotes
-expanded documentation

0.3j
- metadata file with TOC contained spurious text, resulting
  in a non-valid Epub file

(markd)